A Tree Lopper or an Arborist? How to know the difference

https://iris-wiki.win/index.php?title=How_to_tell_when_you_are_dealing_with_a_Tree_Lopper_or_an_Arborist_15882

One of the very pressing needs following a thunderstorm is to have the branches and leaves of the trees in a compound trimmed. Here a differentiation has to be produced between the Arborist and the tree lopper